12057on PERSPECTIVE.
Prob. XIV.
73.
To throw a Body into Perſpective, having
ſome one or all of its Sides inclined to the Geometri-
cal Plane.
ſome one or all of its Sides inclined to the Geometri-
cal Plane.
The Appearances of the Lines forming the
Angles of the propoſed Body muſt be found: And
this may be eaſily done by Prob. 10. 1169. takes in all the Caſes. And in this Manner the
Appearance of a Pyramid, an inclined Priſm,
& c. may be found. But nevertheleſs, it hap-
pens ſometimes, that the Operations of the pre-
cedent Problem may be abbreviated; as when
the Extremity of ſeveral Lines are found in one
and the ſame Line, or when inclined Lines, that
have difficult accidental Points, interſect one
another, and ſo mutually determine each other.
This will appear manifeſt by the following Ex-
amples.
Angles of the propoſed Body muſt be found: And
this may be eaſily done by Prob. 10. 1169. takes in all the Caſes. And in this Manner the
Appearance of a Pyramid, an inclined Priſm,
& c. may be found. But nevertheleſs, it hap-
pens ſometimes, that the Operations of the pre-
cedent Problem may be abbreviated; as when
the Extremity of ſeveral Lines are found in one
and the ſame Line, or when inclined Lines, that
have difficult accidental Points, interſect one
another, and ſo mutually determine each other.
This will appear manifeſt by the following Ex-
amples.